Expansible reamer



B. M. KLINE. EXPANSJBLE REAMER APPLICATION FILED JUNE 15, I921.

Patented Nov. '14, 1922.

Patented Nov. 14, 1922.

srres tiiaiee rare ri ica BENTON M. KLINE, OF LYKENS, PENNSYLVANIA, ASSIGNOR TO REIFF AND NESTOR COMPANY, OF LYKENS, PENNSYLVANIA.

EXPANSIBLE REAMER.

Application filed June 15,

To all whom it may concern:

Be it known that I, BENTON M. KLINE, a citizen of the United States, residing at Lykens in the county of Dauphin and State of Pennsylvania, have invented certain new and useful Improvements in Expansible Reamers, of which the following is a specification.

lWly invention relates to expansible reamers and has for its principal object to provide an improved device of this character which is highly efficient and durable, has a panying drawings forming a part of this specification, wherein:

Figure 1 is a side elevational view of my improved reamer.

Figure 2 is a longitudinal sectional view of the device.

' Figure 3 is a fragmentary longitudinal sectional view taken on the line 33 of Figure 1 and looking in the direction of the arrows.

Figure 1 is a transverse sectional view taken on the line 4-4: of Figure 2 and looking in the direction of the arrows.

Throughout the following detailed description and on the several figures of the drawing, similar parts are referred to by like reference characters. The reamer comprises an elongated cylindrical body portion 1 having at one end an integral extension 2 of reduced diameter forming a shank portion, said shank portion having a squared. end portion 3 by means of which it may be attached to an operating spindle.

The body portion 1 is provided with a central longitudinal bore 4 opening through its outer end. The body portion 1 is also provided with longitudinal slots or grooves 5 which open into its bore. The inner end walls of the slots 5 are inclined or undercut as indicated by the reference numeral 6.

Positioned in the bore 4. is the expander plug 8 having cone portions 9, three in number. The cutter blades 7 bear directly upon 1921. Serial No. 477,845.

the cone portions, the inner edge of each blade having three inclined portions 10 to cooperate with the three cone portions 9.

The, outer end portion 11 of the body portion 1 is reduced and screw-threaded internally and externall and the outer end portion of the expan er plug 8 is cylindrical and screw-threaded for cooperation with the internal screw, threads of said end portion 11.

The end portion 12 of the body portion 1 adjacent the shank portion 2 is also reduced in diameter and screw-threaded eX- ternally. Fitting upon the reduced end portions 11 and 12 are look nuts 13 and 14:.

The ends of the cutter blades 7 are beveled and the inner beveled ends cooperate with the undercut end walls 6 of the slots 5 and also with the undercut end wall of the locknut 14. While the lock-nut 14: may be adjusted by reason of its screw-thread d connection with the reduced end portion 12 of the body portion 1, it will ordinarily not re quire any adjustment. The outer beveled ends of the cutters 7 cooperate with the undercut end wall of the lock nut 18.

The outer end of the expander plug 8 is flattened or faceted to facilitate the cooperation therewith of a tool by means of which to turn the expander plug.

It will be obvious that screwing the locknut inwardly upon the reduced end portion 11 will cause its inner undercut end to engage the beveled outer ends of the cutter blades tending to move the cutter blades longitudinally of the body portion 1 towards the shank portion 2 and at the same time tending to press the cutter blades radially inwards into close frictional engagement with the cone portions 9 of the expander plug. clined inner edge portions 10 of the blades The engagement between the inandthe cones 9 will tend to force the exbody portion 1. to indicate to the user oi the device how far the lock nut 13 must be backed oil in order to permit the expansion of the reanier to the desired cutting diameter. i

When it is desired to entirely remove the expander plug 8 from the bore oi the body portion 1 the lock nut 13 is loosened and the expander plug screwed inwardlyuntil the flattened portion is adjacent the end of the body portion. This operation will move the cutting blades radially outwards a sufficient amonnt'to permit the expander plug to be entirely removed from the device by screwing it outwardly.

It will be observed that the normally expanding moven'ient of the bladesis obtained by a movement of the expander plug inwardly or the bore of the body, causing the inclined portions of the blades to ride upardly on the conical surfaces of the plug. When, however it is desired to displace the blade completely from the slots in order to sharpen the edges or for replacement in the event of breakage, the expander plug is moved outwardly of the bore, whereupon the large portions of each cone will come into contact with the roundii'ig shoulders 7* of the blades and quickly displace the blades from the slots sufliciently far to permit them to be easily grasped with the fingers and pulled completely out. In the movement or" the blades in the manner described it is to be understood that the nut 13 is backed off on the threaded portion sufiiciently far to disengage the inclined ends and thus tree the blades for displacement from the slots.

The blades 7 it will be seen bear on the cones 9 for substantially their full length and for that reason a great range of expansion is provided.

Having thus described my invention, what I claim new and desire to secure by Let ters Patent is:

1. An expansible reamer oil theclass described comprising a body portion having an axial bore, said body portion having a series of slots extending longitudinally thereof, an expander plug mounted within. the bore and having a plurality of cone portions, and a series of cutter blades disposed within the slots of the body each having its inner edge formed with a series of inclined portions for cooperation with the cone portions of the plug whereby on movement of said plug inwardly to etlect expanding movement of the blades, each inclined portion 01'? the blades terminating in a rounding shoulder with which the large portion of the cones co'act to abruptly displace theblades from the slots upon movement of the plug reversely to the blade extending movement aforesaid.

2. An expansible reamer comprising a cylindrical body portion having at one-end a tool engaging shank for operating the reamer and having a hollow bore extending into and through the major portion thereof fromfthe other end, a body portion having a series of slots extending longitudinally thereof and opening into the bore, the body port-ion being externally threaded adjacent to each end of the slots, a series of blades mounted in the slots, adjustable lock-nuts mounted upon the threaded portions 01. the body aforesaid to coact with the ends of the blades for locking them against displacement at predetermined adjustments, each blade being provided on its inner edge with a series of inclined portions terminating in rounding shoulders, and an expander plug mounted within the bore of" the body portion and having threaded connection with the latter tlor movement into the bore to produce expanding movement of the blades. said plug being provided with a series of conical portions the surfaces of which correspond with the inclined portions of the blades, the large portion of each conical portion being adapted to coact with the rounding shoulders of the blades when the expander plug md'ved from the bore to efiect quick displacement of the blades from the slots.

In testimony whereof I afiix my signature.

BENTON M. KLINE. 

